Toshiba Intermittent Power Loss – Overheat or Loose Connection

Microwave runs for a few seconds then shuts off completely, sometimes restarting after a short pause.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Overheating magnetron or cavity triggering thermal cut-out,Loose power cord connection inside unit,Failing control PCB relay,Defective door switch causing intermittent contact

How to Fix / Troubleshooting

Safety first: Unplug the microwave before inspection.

Steps to narrow down the cause:

  • 1. Check ventilation: Ensure vents are not blocked and that there is adequate clearance around the microwave.
  • 2. Observe pattern: Note whether the shutdown happens only after longer runs or even with short 10–20 second tests. Overheat issues usually require some run time.
  • 3. Test door sensitivity: While running a short cycle, gently press or lift the door handle. If the unit cuts out when the door is moved, a door switch or latch is likely faulty.
  • 4. Try a different outlet: Eliminate a loose wall outlet by testing on another circuit.

Next step: If the problem persists, a technician should check internal thermal cut-outs, control board relays, and wiring connections.

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Repair Difficulty

Hard 4/5

Required Part

Thermal Cut-Out
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